x86, mce: machine check recovery for applications

This series adds code to recognise the machine check signature for a recoverable error in the data path (Advanced SKUs of "Sandy Bridge" server processors are the first to be able to allow s/w recovery for this case), save the required information in the machine check handler and then call to the generic memory_failure() code to try for graceful error recovery (sending SIGBUS to affected process(es)).

Updates since last version (December 15th)

Part1-4: unchanged

Part5: Changed stub function for CONFIG_MEMORY_FAILURE=n case to BUG_ON if it is handed an MF_ACTION_REQUIRED case (this indicates an error in severity calculation). Drop "Memory error recovered" message (enough chatter already).

Part6: Only pass back an ACTION_REQUIRED severity to a kernel if it is built with CONFIG_MEMORY_FAILURE=y (i.e. has the code to take the action).

Whole series is available in:

git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git mce-recovery

Tony Luck (6):
HWPOISON: clean up memory_failure() vs. __memory_failure()
HWPOISON: Add code to handle "action required" errors. x86, mce: create helper function to save addr/misc when needed x86, mce: Add mechanism to safely save information in MCE handler x86, mce: handle "action required" errors
x86, mce: Recognise machine check bank signature for data path error

 arch/x86/kernel/cpu/mcheck/mce-severity.c |   16 +++-
 arch/x86/kernel/cpu/mcheck/mce.c          |  179 ++++++++++++++++++++---------
 drivers/base/memory.c                     |    2 +-
 include/linux/mm.h                        |    4 +-
 mm/hwpoison-inject.c                      |    4 +-
 mm/madvise.c                              |    2 +-
 mm/memory-failure.c                       |   96 ++++++++--------
 7 files changed, 197 insertions(+), 106 deletions(-)

1.7.3.1